Bradford h



B. H. WHITING.

CASING FOR LOCOMOTIVE'SCREWS.

APPLICATION FlLED APR.25. 19w.

,3 14,557, Patented Sept. 2, 1919.

Z2 i6 EW@7O% I 'fimayardiwzzzzz UNITED. STATES PATENT OFFICE.

BRADFORD H. WHITING, OF CHICAGO, ILLINOIS, ASSIG-NOR TO WHITING FOUNDRY EQUIPMENT COMPANY, OF HARVEY, ILLINOIS, A CORPORATION OF ILLINOIS.

CASING FOR LOCOMOTIVE-SCREWS.

Application filed April 25, 1919.

To all whom it may concern:

Be it known that I, BRADFORD H. WVHIT- ING, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Casings for Locomotive-Screws, of which the following is a specification.

This invention relates to screw jacks for lifting heavy objects, of the general class shown in the Hardy & Bourne Patent, No. 1,176,751, dated March 28th, 1916, in which the end or some other portion of a load carrying bar closely embraces, but does not actually engage, the lifting screw.

The object of the invention is to provide between the lifting screw and the load carrying bar an intermediate member which serves the double function of acting as a grease or oil receptacle for the screwitself, and prevents the load carrying bar from actually contacting the screw proper with ponsequent injury to one or the other or the oad.

The invention consists in means for carrying out the foregoing objects, which can be easily and cheapl made, which is satisfactory in operatlon, and is not readily liable to get out of order. More particularly, the invention consists in the features and details of construction hereafter more fully set forth in the specification and claims.

Referring to the drawings, in which like numerals represent the same parts throughout the several views,

Figure 1 is a sectional view through a locomotive lifting jack equipped with mechanism of this invention in its preferred form.

Fig. 2 is a plan View of so much of the mechanism shown in Fig. 1 as is necessary to illustrate this invention.

In the mechanism shown in the drawin s, the lifting screw 10, inclosed within t e case 12, is rotatable in either direction by the propelling mechanism 14, forming no part of this invention and therefore not dcscribed in detail. Threaded on this screw, as in prior devices, is a collar 16 integral with projecting lugs 18, slidable in frame 12 Specification of Letters Patent.

Patented Sept. 2, 1919.

Serial No. 292,560.

as shown in Fig. 2. This collar 16 carries the end of the load bearing cross irder 20, forked at its end to make PIOjOCtHI teeth or lugs 22 which rest upon the collar 16, and embrace opposite sides of the screw 10.

In a structure of this class it is neither designed nor desirable that any portion of this girder 20 shall ever actually engage the threads of the screw 10, but. it is desirable, for effective operation, that they be conveniently near to the screw. In order to make this ideal condition possible, I interpose about the screw itself a tubular metallic case member 2a flanged at 26 to embrace a circular flange 28 formed on the collar 16, with sufficient tightness so that grease carried inside the case member 24 and adjacent to the screw threads will not leak out. This case member 24 is of such a. diameter that, as shown, neither tooth 22 on the end of the load carrying girder 20 is supposed to touch it, but if such a contact is established between a tooth 22 and member 24, no harm is done because the case member 24 protects the screw from the tooth.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is

1. The combination with a lifting screw, a load supporting collar threaded thereon, a load supporting bar carried by the collar, embracing the screw and normally clearing it, and an intermediate casing between the screw and load supporting bar, protecting the screw from the bar.

2. The combination with a lifting screw, a load support-ing collar threaded thereon, a load supporting bar carried by the collar, embracing the screw and normally clearing it, an intermediate member fitting sufficiently tight on the screw to form a grease receptacle about the screw and at the same time protect the screw from the bar.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

BRADFORD H. WHITING.

Witnesses:

LEONA Conn, F. G. Pn'rnns.

copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents Washington, D. 0." 

